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Nu. 622,603. Patented Apr. 4, i899. F. N. BUSHNELL.

STEAM ENGINE VALVE MEGHANISM.

(Application filed June 23, 189B.)

(No Modal.)

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Witnesses Inventor.

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NiTnn STATES PATENT Orifice,

FREDERIC N. BUSIINELL, OF PROVIDENCE, RHODE ISLAND.

STEAM-ENGINE VALVE MECHANlSlVl.

SPECIFICATION forming part of Letters Patent No. 622,603, dated April 4, 1899.

Application filed Tune Z3, 1898. Serial No. 684,208. (No model.)

To @ZZ whom it 71cm/ concern' Be it known that I, FREDERIC N. BUsHNELL, of Providence, in the count-y of Providence and State of Rhode Island, have invented certain new and useful Improvements in Steam-Engine Valve Mechanism; and I do hereby declare that the following is a full, clear,and exact description thereof, reference being had to the accompanying drawings, an d to the letters of reference marked thereon, which form a part of this specification.

This invention refers to steam-engine valve-operatin g mechanism, and especially to the connection of the eccentric-rod with the arm of the valve. It is fully explained and illustrated in this specification and the accompanying drawings.

Figure l shows a part of the valve-arm and the joint-case, taken partly in section on line l l in Fig. 2,- with the eccentric-rod in Fig. 2 is a section of the joint-case and lock, taken on line 2 '2, Fig. 1,1ooking downward. Fig 3 shows a front elevation taken to the right of Fig. l 'with the lock removed fromits position. Fig 4. shows a separate top View of the lock. Fig. 5 is a front elevation of a part of a steam-engine cylinder with the mechanism attached; Y

The object of the invention is to produce a locking-joint to secure the eccentric-rod to the valve-arm that with an allowance for an easy oscillating motion of the rod shall be simple in construction and capable of automatically takin g up all lost motion caused by wear and at the saine time can even when the engine is in motion be thrown in or out of connection by a single movement.

The construction is as follows: A is the arm, attached to or connecteduwith the valve G, Fig. 5. A shell or case D is charnbered in from its outer end and is heldrigidly fast to the arm A by means of a stud B, thev round head of which is countersunk in the bottom of the chamber inside.

This studB has a nut c fitted on its outer end, by means of which the case :is 'clamped fast to the arm A, and a pin or key s is inserted from the inside to 4 keep the case D from turning on the arm.

to allow the eccentric-rod O to slide in it.'

Two ears d d are made on the outer end of the block S, between which the lock J (see Fig. 4) swings vertically on a pin ct, that passes through the ears and the lock. Two recesses c c are milled in the outer side of the eccentric-rod O, and the inner end of the lock J has two teeth c c made on it that fit into the recesses c c in the-rod. The circle on which the teeth c' c are made is struck from a point outside the center of the pin d on which the lock J swings, and when the outer end of the lock moves down the teeth. c' c being on an eccentric curve will enter the recesses c c still deeper, anda weight His put on the outer end of the lock to press the teeth up in the recesses and take up any lostinotion caused by wear. v

In operation when the eccentricfrod C is moved endwise by the eccentric the motion is conveyed through the block S and case D to the arm A'by the teeth C' c' catching in the recesses c o in the eccentric-rod. As the arm A swings back and forth the block turns a short distance each way in the case, the oval holes in the sides of the case allowing the necessary motion to the eccentric-rod. Vhen it is. required to disconnect the rod so it will not move the arm, the handle of the lock J, with the weight I'I, is turned up and the teeth c c will be turned down out of the recesses c c in the rod and it will be free to slide in the hole in the block S without moving any of the. parts, and by dropping the handle and weight the connection is again made. As before stated, the weight H holds the teeth up close in the recesses, and if any wear takes place it forces the teeth a little farther up, and owing to their eccentricity they advance alittle deeper into the recesses and take up all the wear, and thus prevent all lost motion. A spring may be substituted for the weight II, if preferred.

In some situations it may be preferred to make the stud B and block S in one piece and made rigid on the arm andhave the case D loose on the block to carry the lock held in ears made on it. The operation of the lock would be the same if made in either way.

Having thus described my improvements, I claim as my invention and desire to secure by Letters Patent- 1. In an operating connection for an engine valve-gear, the combination of an eccentricrod a case rigidly secured to ,the swinging arm that operates the valve-gear, a block fitted to turn in said case and having a hole in it to receive the eccentric-rod, ears made on said block, a cam held between said ears to swing transversely to the line of said rod, a tapering transverse recess made in said eccentric-rod to receive a' tapering tooth on the inner side of the cam, an arm on the outside of the cam, a weight on the outer end of the arln to hold the cam in or out of engagement with the rod, substantially as described.

2. In aconnection for an engine valve-gear,

the combination of an eccentric-rod, a ease with holes in its sides connected to the swinging arm that operates the valve-gear, a block iitted to turn in said case having a hole in it to register With the holes in the case, through which said eccentric-rod passes to hold the two together, a cam having one or more tapering teeth, held in ears. to swing transversely to the line of said eccentric-rod, one or more tapering transverse recesses made in said eccentric-rod to receive the teeth of said cam, a weight on said cani to hold it in or out of engagement with the rod and to cause the cam to take up wear and prevent lost motion, substantially as described.

In testimony whereof I have hereunto set my hand this 11th 'day of June, A. D. 1898.

FREDERIC N. BUSHNELL. In presence of- BENJ. ARNOLD, M. E. CLEVELAND. 

